Stamp-mill.



No. 781,912. PATENTED FEB. 7, 1905. R. SGHORR.

STAMP MILL.

APPLICATION FILED MAY 24, 1904.

2 SHEETS-SHEET l.

No. 781,912. PATENTED FEB. '7, 1905. R. SCHORR.

STAMP MILL.

APPLICATION IILED MAY 24, 1904.

2 SHEETS-SHEET 2.

lnv enter.-

UNITED STATES Patented February '7, 1905.

PATENT @FFicE,

STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 781,912, dated February '7, 1905.

Application filed May 24,1904. Serial N0y 209,585.

To on]? whom it nmy concern.-

Be it known that I, ROBERT SCIIORR, a citizen of the United States of America, residing at San Francisco, county of San Francisco, and State of California, have invented certain new and useful Improvements in Stamp-rNIills; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to common multiplestamp mills for crushing mineral ores and to certain improvements therein, as hereinafter described, and illustrated by drawings that form part of this specification.

Hy improvements consist in certain novel features of construction and include a more effective action of the screens, the material and water acting thereagainst by a pulsating action instead of violent splashes, such pulsations recurring at each motion of the stamps upward and downward, the mortars made with am pli tied issues or discharge-ways, means to remove light foreign matter from the mortar by its buoyancy, and means to separate fine sand from this buoyant matter and return the same to the discharge from the screens, with various other features of a constructive and operative kind that will be hereinafter more fully explained and described.

The objects of my invention are to attain an increased effect of such stamping-machines, to increase the endurance of all wearing parts, and save a greater amount of metal from the ores than what has hitherto been attainable by machinery of this type.

Referring to the drawings, Figure I is an elevation, partly in section, showing a stampmill embodying my improvements. Ifiig. II is an enlarged transverse section through the mortar shown in Fig. I.

The essential feature of my invention is to attain a pulsating action uniform over the whole surface of the screens, avoiding the violent splash and unequal action that occurs in an unfilled mortar; also, to avoid the abrasive action of the impinging sand and partially-crushed ore that abrades and destroys inside of the mortar. There is also in the usual manner of operating such mortars a limited amount of screen area, and the material already crushed to the required fineness is not freely discharged, leadin to dead stamping and consequentsliming. Ihesc impediments are avoided in the construction now to be described.

lteferring to Fig. I, it will be seen that the.

mortar 1, dies 3,s1amps I, stamp-heads 5, and framing (3 are of the usual coustriu-tion and do not require detailed description. So, also, the cams T, tappets b, stamp-stems 9, stembearings 10, ore-bin ll, cam-shaft l2, and driving-pulleys 13 are all arranged in the usual manner.

The mortar I is set on the usual foundation 15, is provided with an inlet-way II for ore and a removable plate 17 at the front to give access to the interior. Referring to Fig. II, where the construction corresponds to Fig. l, the screens 18 are set in a sloping position at the top of the mortar 1, fastened in the usual manner, the discharge that passes through them flowing off into a surrounding trough or launder I9 and from thence over sloping plates, riffles, or other catchment devices on the movable apron 20. (Shown in Fig. I.)

In operating broken ore is supplied through the inlet-ways 14; from the bin 11 over a pivoted apron 22, agitated by the tips of the cams T striking thereon at 23, as indicated in Fig. I. The quantity of ore supplied is regulated by a gate or slide. 24 and passes over the plate 22 and through the opening 25 into the spout E27 and to the mortar. 'Ihc mortar I is charged with water 26 from the pipe 21' up to a level that permits it to rise against the screens 18 by the displacement and impetus of the stem-head 5 whenever the latter descends. After the stamp has fallenand made its stroke the stem-head is submerged and when raised the water follows by entrainment in the chamber 28 and then by sinking therefrom to seek its level reacts again beneath the screens 18, producing two discharge impulsions through the screens 18 for each stroke of the stamps. The agitation produced in the the screens; also, to obtain large copper plates mortar I by the falling stamps I and the upward wash of the contained water 26 at both the falling and rising movement of the stamps causes a rhythmic oscillation and upward wash of the fine sand as fast as it is produced, keeping the same in suspension and ejecting through the screens 18 a volume equal to the entrained sand and the water supplied through the pipe 21, these impinging equally over the whole surface of the screens 18. This upward wash of the fine material in the water maintains a graded separation and prevents repulverization of the ore into slimes, as must occur when the discharge through the screens is by violent impingement thereon and its escape an accident of the position of the sand particles.

In the base of the mortar 1 I place removable corrugated plates 30 and line the interior of the sides with amalgamating-plates 31 or employ any of the usual means for catching gold when auriferous ore is being crushed, and, as may be seen, there is no limitation of such surface when the screens 18 are placed at the top, as shown in the drawings.

The pulsations caused by strokes of the stamps cause an overflow at 34: equal to the amount of water supplied through the pipe 21. This overflow carries with it the fine sand, also any light foreign substances in the ore, which flow down the spout 35 into a launder or trough 37, and the finer material, falling through a screen at 38 into a hopper 39, passes down the pipe 40 to the apron 20 for further treatment with the pulp discharged from the screens 18. In this manner it will be seen that the operation of orecrushing is performed without violent and abrasive action and separation at the same time peformed by impulsive currents acting uniformly over the whole of the screen-surface, also that there is ample space for catchment area in the interior of the mortar on all sides thereof.

Having thus described the nature and objects of my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a stamp-mill for crushing ore, a mortar, with outwardly-flaring sides, a die in the bottom thereof, a dropping stamp therein, means for supplying water thereto, screens at the top of the mortar extending inwardly from the top of the flaring edge, and means for conveying away the water and suspended material passed through the screens by the action of the stamp, substantially as specified.

2. In a stamp-mill for crushing ore, a mortar, with outwardly-flaring sides, a die in the bottom thereof, a dropping stamp therein, means for supplying water thereto, screens at the top of the mortar extending inwardly from the top of the flaring edge, and a collectingtrough surrounding the mortar at the top, outside of the screens, substantially as specified.

3. In a stamp-mill for crushing ore, a mortar, with outwardly-flaring sides, a die in the bottom thereof, a dropping stamp therein, means for supplying water thereto, screens at the top of the mortar extending inwardly from the top of the flaring edge, a collecting-trough surrounding the mortar at the top, outside of the screens, and an apron to convey away the material discharged from said trough, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROBERT SCHORR. 

